Automatic stop mechanism for phonographs.



A. NIBLSBN. AUTOMATIC STOP MECHANISM FOR PHONOGRAPHS. APPLICATION FILED APR.15,1912.

1,096,794. Patented May 12, 1914.

2 SHEETS-SHEET 2.

To jall fw/0m it muy concern Beit knownthat I, Axor: Nnensicx, a citii `lzen of theDanislriMonarchy7 and a resident ."f'foftheicity, county, and State of N ew York, have. invented certain new and useful Im- "pio'vements iIrAutomatic Stop Mechanism y'forPhonographs; of which the following is i 'fa specification.I i @This inventionrelates to` improvements in 'automatic stopi mechanisms for phonographs' and the object of the invention is to -fprovide` a simple-automatic stopping device for' disk 'record'maehines whereby the disk Y isy `automaticallystopped when the 'last lfsoundfof the record has been emitted.

-xvi Tothis end the invention comprises such lements-and combinations of. parts as are LiL.lla'ereinafterdescribed while reference is had tothe accompanying drawings in which- ZOCMFigure 1 is a` plan view of a disk record phonograph equipped with my stop mecha nisnr'with parts'removed, and Figs. 2 and 3 'are views in 'elevation of the stop mecha- 'ni`sm lookinginhthe directlon of arrows 2 land 3- respectively "in Fig. 1.

ViIn Fig. 1 thefphonograph is represented '"ibythe usuayldisltl record 4 and the sound reproducingapparatus or horn 5. The disk 1s t as'lusualycarriedtby a turntable 60 supported "on"'a"piyot" 6.1" The base or box of the ma- -Wahine,is"not`showtn5 nor is it necessary to dey scribe the operationof the machine which is "l matter of common knowledge, as is also `the fact `that among the numerous `records "produced,"scarcely two are alike; however they all 'vary according to the length of the 'f"' lmusical'composition to be reproduced.

Itis" an objeetof my invention to provide a simple andeffective stop mechanism capable of withstanding .ordinary usage. l*and soarra'nged as toy stop the rotation of the record atakti'me very soon after reprodueing` of the record has been completed; my inventionfinsnr'es that the record is not *broughtto restfbefore the completion of the'y reproduction.

Rferringto the drawings the numeral 7 Vrepre'sentsa bracket or base adapted to be secured to thesoc'ket 8 .in which the tone 5 ytubefoscillates` by any suitable clamping device 9. The base 7`supports a vertical shaft 10 to Whichis secured a pulley 11 and a worin 12,*Which 'engages with a worm wheel 13l on ahorizontal shaft 14 mounted in a bearing 1.5 and which shaft also carries a Worm 16 meshing with a Worm Wheel 17 on STATES PATENT OFFICE fr eE'innLsENjoF NEW YoRKrll-Y- i k "j -3 Vfanroiuarro srrory MCHANISM FOR PHoNoGnAPHs. i i

p L Specication 0f Letters ltent Patented May 12,.` `1914.

Application led April 15I 1912. Serial No. 690,715.

a second vertical shaft 1S. To the latter is fastened a disk 19 and in frictional contact with the disk 19 is another disk :20 which supports a hand Q1. A spring 2:2 supplies the necessary friction to cause the disk 0 to move with the disk 19.

The hand Q1 carries a contact 23 and an insulated knob Q4. A hook Q5, secured to a second hand 26.' is adapted to engage the knob Q4. The hand 26 also carries an insulated knob Q7 and is itself part of a disk QS in frictional contact with a disk Q9 of suitable insulating` material and pivoted on a stud 30 in a bracket 31 secured to the base 7. A springl Q2 alsoin this instance causes the friction between the disks Q8 and Q9. The disk 28 is cut out as at 32. Fig. 1, and on the bracket 31, but insulated therefrom, there is a spring contact 33 adapted to contact with the disk QS except when the cut out portion 3Q is opposite the spring. A third hand. 34 is secured in any suitable manner to the horn 5 so as to oscillate therewith and has a hook 35 adapted to engage knob 2T on hand QG.

On the base 7 there is pivoted at 36 anarm 37 of conducting material." The position of the arm 3T with relation to the turntable `60 may be adjusted by means of the pivot screw 36. `The arm 37 carries a magnet 3S. The magnetic plunger 39 is insulated from the magnet by an insulating sleeve 40. A fixed core 41 is also provided within the sleeve 40 and a spring 42 normally forces the plunger 39 outward against a stop 43 andinto a position to act as a stop for a pawl 44 pivoted on a thmnbserew 45 which is secured to the arm 37. A brake-wheel 46 is fixed eccentrically on the thumbscrew. 45. A spring 56 tends to throw the brake-wheel against the rotating member 60.

47 is a source of electrical current, such as a small dry battery for instance. The one pole is connected to the one end of the magnet coil. The other end of the latter is connected by wire 49 to the core 41 and the other pole of the battery is connected by wire 50 to the aforesaid contact spring 33 on bracket 31. A pulley 51 is attached to the pivot 6 to rotate with the disk 4 and a belt 52 passes over this pulley and the pulley 11 aforesaid.

The arrangement of the gearing or transmission mechanism carried by the base-7 is such'that the hand 21 on the shaft 18 moves at a speed regulated by the speed of the disk but slower than the speed of the hand 34 which moves with thel horn f5.v lVhen the stylus isk placed inthe outer groove of the record the three hands aforesaid are moved toward the record center 6 and brake wheel is turned by the thumbscrew away from,

the disk and the pawl 44 snaps in behind the plunger 3S) as shown in dotted lines. The position of the horn determines the position of the hand 34 which pulls back the hand 26 which pushes back the hand 21. Thus at the start the current is broken. The path of the circuit from the battery through wire to the contact spring 33 is broken between the spring 33 and the nand 26 because of the cut out position 32 in the disk 2S. But as` soon as the horn begins to move inwardly the hand 26 is rotated by the hand 34, consequently the hand 26 leaves the contact 23, which latter lags behind, but the contact will now be made between the disk 28 and contactv spring 33, but not completing the circuit.

During the playing of the record it will `be 'seen that the arm 26 is being pushed ahead by the hand34 and that the hand 21 follows a slight distance behind as it moves at a slower speed, but the Contact is broken all the time between arm 26 and contact 23. The hook 25 is for the purpose of pulling the arm 21 behind the arm 26 in case the former does not for any reason move tast enough. lVhen the horn ceases to swing in. wardly toward the centerof the record, that l is when the last tone has been played the movement of the hands 34 and 26 ceases and they stop, but the hand 2l catches up with them, so to speak, until contact 23 touches arm 26. This closes the circuit from the battery and the current now passes from the latter througlrO, 33, 26 and to the arm 21 and from the latter' through the base 7` to arm 37, to pawl 44,'plunger/39, core 41, wire 49, through the magnet andback to the battery. The closing of the circuit energizes the magnet 38 which pulls up the plunger 39 which frees the pawl 44 and the spring 56 now forces the brakewheel against the turntable and the latter stops together with the disk record. The moment the plunger is withdrawn, the circuit is again broken so that I use the current only for a moment, long enough to energize the magnet.

Inasmuch as the contact 23 contacts with the arm 26'im1nediately after, but never before the record is played, it will be seen that the latter is stopped as soon as the music ceases, obviously a great advantage. It will have been observed that myinvention does not demand any setting or adjusting each time a new record is put on, except that the pawl 44 is moved in behind the plunger.

Changes in the detailed construction may of course be made within the principle of the invention and the scope ofthe appended claims.

vmember, an electromagnet for controlling 1. In a brakeV the combination with a swinging member and a rotating member, driving mechanism for the latter, a plu? rality of electric contact elements, one of 7( said contact elements being adapted to be movedin a given direction by the said swinging member, means actuated by the driving mechanism ot' the said rotating member for moving another of said contact elements in a direction toward said first named contact element and at a speed not greater' than that of said iirst named contact element, a brake for the said rotating said brake, a source oit electric energy and electrical connections between the latter, said contact elements and said electromagnet, whereby upon cessationofthe inward swinging of the said swinging memberthe electric circuit through the source and the electromagnet will be completed by the said second contact element overtaking and contacting with the said first contact element.

2. In a brake the combination with a swinging member and a rotating member, driving mechanism for the latter, ,two electric contact elements, an arm mounted on the said swinging member for moving the first contact element in a given direction, a transmission mechanism interposed between the driving mechanism of the rotating member and the second contact element for moving the latter toward the said rst`,contact element at a speed not greater than that of the latter, a brake for the" said rotating member, an electromagnet for controlling said brake, a source of electric energy and electric connections between the latter, said Contactl elements and electromagnet, where 105 by upon cessation of the inward swinging of the said swinging member the `electric circuit through the said source and the electric magnet will becompleted by the'said second contact element overtaking'and con- 110 tacting with the said irst contact element.

3. In a brake the combination lwith a swinging member and a rotating member, a support, two electric contact elements coaxiallymounted on said support, means for rotating one of said contact elements in a certain direction as the said swinging'member is swunginwardly over the said rotating member, means for rotating the other of said contact elements in said certain direction, the angular speed of the latter Contact element being normally not greater than the angular speed of the said first contact element, means carried by the latter for intermittently accelerating the speed or' the said 12.3 second Contact element, a brake 'for said rotating member, an electromagnet for ,controlling said brake, a source of electric energy and electric connections whereby upon cessation of the inward swinging of i fthe-saiiewinging member the electric circuit hilough the source and the electromag- `net will be completed by said second contact element contacting with the said first conta ct element. A

4. In a brake the combination with a swinging member and a rotating member, a plurality of movable electric contact elements, means for moving said contact elements in one direction but at different speeds, one ahead of the other while the said swinging member is swnng inwardly overl the said rotating member, va brake tor the rotating member, an electromagnet control- 1in said brake, a source of electric energy i5 i an electrical connectionsl whereby upon cessation of the inward swinging of the said swinging member the electric circuit will be completed by one of the-said electric contact elements overtaking and contacting with another of said electric contact clements.

Signed at New York, N. Y., this 11th day of April 1912.

AAGE NIELSEN. iVitnesses:y

K. G. LE ARD, J oAN KoNicsEno. 

